Centrifugal apparatus for treating sewage.



J. BROMET, P. THORMAN diz; H. C. WUOD.

CENTRIFUGAL APPARATUS POR TRBATING SEWAGE. APPLIOATION FILED MAX 19, 191s.

3 SHEETS- SHEET l.

Patented June 2, 1914.

J. BROMET, F. THGRMAN H. C. WOOD. GENTRIFUGAL APPARATUS FOR TRBATING SEWAGB.

APPLICATION FILED MAY 19 W13.

Patnted June 2, 19M.

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J. BROMET, F. THORMAN & H. O. WOOD.

OENTRIFUGAL APPAATUS FOR TREATING SEWAGE.

APPLICATION FILED MAY 19, 1913.

Patented. June 2, 19M.

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3 SHEETS-SHEET 3.

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JOHN BROMET, FRANK THORMAN, AND HENRY CLAYTON WOOD, F TADCASTER, ENGLAND.

CENTRIFUGAL APPARATUS FOR TREATING SEWAGE.

T0 all 'whom it may concern;

Be it known that we, JOHN BROMET, FRANK THORMAN, and HENRY CLAYTON Woon, subjects of the King otGreat Britain and Ireland, residing at lFadcaster, in the county of York, England, have invented new and useful improvements in Centrifumatter from the liquid in sewage and other scribe mixtures of solids and liquids, and to avoid the contamination of the eilluent by the untreated mixture. For this purpose we discharge the mixture of solids and liquids directldy into the apparatus hereinafter de- The said apparatus may be used either single or, by placing several in series, as may be required according to the volume of material to be dealt with. In the case of sewage, the contents of the sewer, on entering the sewage disposal works and after being passed through a. rough screen, are mixed (if necessary) with a suitable precipitant,l and are at once passed through the apparatus. ln the case of trade waste, from works and factories and the like, dealt with by manufacturers themselves, the waste is rough screened and precipitant added (if necessary) as soon as possible after the waste has lett the factory.Y

Figure l is a front elevation (partly in section) showing the general arrangement of our improved centrifugal apparatus as arranged in series. Fig. 2 is a plan of Fig. 1, also partly in section. Fig. 3 is a side elevation (partly in section) of Fig. 1. Fig. A is a sectional elevation on an enlarged scale showing details of construction of centrifugal apparatus. Fig. 5 is a sectional plan of Fig. 4,

Similar references are employed to indicate corresponding parts throughout the several views.

According to our said invention we provide revolving cylindrical apparatus consisting primarily of three concentric pans. The outer `pan A is 'formed with vertical sides, flat bottom B, and flat top C with central tunnel head D, the pan A being ro- Speccation of Letters Patent.

Application led May 19, 1913.

Patented June 2., 1914..

serial No. 768,591.

tated by an axial shaft E having driven pulley F and roller-bearing footstep G, to which shaft the pan A is rigidly secured at the bottom by means of a keyed boss H. In the bottom of the outer pan A, toward its outer periphery, are sludge and drainage valves l controlled from a hand wheel J by aI lever K, sliding block L, and link motions M attached to the under-side of the valves. The intermediate pan N is separate from and slightly less in diameter than the outer pan A and is formed with vertical sides fitting inside the outer pan, and is rotated by a loose sleeve O 'tted over the central shaft E and driven by gear wheels P Q from the counter shaft R having suitable disconnecting gear. The sleeve O and intermediate pan N are connected at the bottom by a keyed boss S having a series of radial arms T, the said intermediate pan N being quite open at the bottom. The joint at the bottom and top of the intermediate pan N is formed with brass strips and leather or other material suitable for protect-ing the pans from binding. The inner pan U is of considerably reduced diameter and is tted within the outer and inter1nediate pans. It is formed with vertical sides, flat top V, short loose boss W' at the top within which the driven sleeve 0 Ot the intermediate pan N is free to revolve, and radial strengthening arms X at the open bottom attached to a central annular ring Y fit-ting loosely around the said driven sleeve O. rlhe tops of the inner and outer pans U and A are connected rigidly to get-her by means of a series of pipes Z each having an external delivery pipe l extending radially outward toward an annular trough or channel 2 surrounding the apparatus and communicating with an effluent channel 3 leading to suitable filters or irrigation land. Attached to the outer side of the inner pan U are upright Scrapers 4 having strengthening stays 5, these Scrapers projecting across the annular space between the intermediate pan N and the inner pan U, and being so fitted as to allow the collected sludge or solid matter to be freely emptied through the aforesaid sludge valves l in the bottom of the outer pan A.

The 'modus operandi is as followsz-Jlhe sewage or other` foul wastes or combinations of solids and water to be dealt with is :ted continuously into the machine, by way of the sewage channel 6 and feed trough 7 through the funnel head D of the outer pan A, and passes down the space between the tops of the outer and inner pans. The sewage being thus fed direct to the periphery of the apparatus, where the greatest pressure exists, the solid matter at once separates from the liquids and adheres by the centrifugal pressure to the sides of the collecting or intermediate pan N. The travel of the incoming sewage continues in a downward direction due to head of feed toward the open bottom of the inner pan U, and during the whole of such travel the solids in suspension are being continuously extracted and collected on the sides of the intermediate pan N. The depth,diameter, and speed of revolution of the pans may be varied according to the volume to be treated and the density of the suspended materials or consistency of the mixture. The ordinary principles governing the construction of centrifugals will provide particulars enabling these variations to be made.

The apparatus is designed so that the material to be dealt with has to travel the full depth of the periphery of the apparatus before being discharged. Then the vbottom of the pan is reached the water is clarified, and this clarified water passes under the open bottom of the inner panU and fiows in an upward direction toward the center of the apparatus.

The apparatus provides not only for separating the solids from the liquids but also for providing a compartment for the clarified liquid column which cannot be contaminated by readmixture with the incoming foul solids and liquids. This compartment being preferably tapped at the top in the case of low heads, but it may be tapped at the bottom anywhere under the inner cone or pan U. The space inside the inner pan U may be termed the clarified liquid column.

The clarified water is, by combination of the pressure of centrifugal action and of the head of the feed, continuously extracted through the aforesaid connecting pipes Z and external delivery pipes l, the incoming sewage or foul water being by this means prevented from coming into contact with the clarified liquid. If the efliuent is not clear the speed of the apparatus may be increased.

Before removing Vthe solids collected and concentrated to a semidry condition on the intermediate pan N, the doors of valve I are slightly opened and the water contained in the apparatus is drawn of (while the machine is in motion or otherwise) through the valves I, and is discharged through the drain 8. The collected solids are removed either by stopping the machine, fixing stationary the outer pan A (to which is attached the Ainner pan U with Scrapers) with suitable brake attachments such as are used in hydroextractor work, and independently revolving the intermediate pan N with sludge attached, or (vice versa) by Xing stationary the intermediate pan N and revolving the outer and inner pans, the collected solids in either case being detached by the Scrapers t and emptied through the valves l, for removal by means of hoppers 9, band conveyers l0, and elevator ll.

For the purpose of collecting and discharging the sludge the following alterna tive method may, if preferred, be adopted, that is to sayz-the independently driven pan N may be dispensed with, the sludge deposited on to the periphery of the outer pan A; suitably stayed independently driven rotary scrapers attached to the loose sleeve O being in such case substituted for the fixed Scrapers-4 previously described. The nature of our invention is the same in both these methods, the only difference between the two being that in the former it is the collecting surface and in the latter the Scrapers that are independently driven. In tne case of small installations the apparatus may be provided with a suitable 'metal casing or The improved centrifugal apparatus for` the treatment of sewage and the like, comprising an outer revolving pan, a central inlet head therein, a smaller inner concentric pan connected to and revolving with said outer pan, an independently driven intermediate pan forming a collecting surface for the solids separated during the passage of the sewage from said inlet head toward said inner pan, Scrapers and valves for removing and discharging the collected and concentrated solids, and inclined connecting pipes and external radialV delivery pipes for continuously discharging the claried water from said inner pan without any possibility of contamination by contact with the incoming sewage, substantially as herein set forth. r

JOHN BROMET. FRANK THORMAN. HENRY CLAYTON WOOD. Witnesses:

JOHN E. WALSH, ALLAN BENNETT. 

